<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		div{  width: 100px;
			  height: 100px;
			  background-color: yellowgreen;
			  border:1px solid red;
			  float: left;	}
		div[class^="a"]{
		    background-color:pink;}
	</style>
</head>
<body>
	<div class="a"></div>
	<div ></div>
	<div class="ac"></div>
	<div class="bac"></div>
	<div class="bba"></div>	
	<div id="abc"></div>
</body>
</html>
